Send notifications to partecipants in issue comments (#1217)

* Send notifications to partecipants in issue comments

Closes #1216

Includes test (still failing)

* Do not include "labelers" to participants

Fix test to expect what GetParticipants return

models/issue_test.go

@@ -5,6 +5,7 @@
 package models
 
 import (
+	"sort"
 	"testing"
 
 	"github.com/stretchr/testify/assert"
@@ -58,3 +59,26 @@ func TestGetIssuesByIDs(t *testing.T) {
 	testSuccess([]int64{1, 2, 3}, []int64{})
 	testSuccess([]int64{1, 2, 3}, []int64{NonexistentID})
 }
+
+func TestGetParticipantsByIssueID(t *testing.T) {
+
+	assert.NoError(t, PrepareTestDatabase())
+
+	checkPartecipants := func(issueID int64, userIDs []int) {
+		partecipants, err := GetParticipantsByIssueID(issueID)
+		if assert.NoError(t, err) {
+			partecipantsIDs := make([]int,len(partecipants))
+			for i,u := range partecipants { partecipantsIDs[i] = int(u.ID) }
+			sort.Ints(partecipantsIDs)
+			sort.Ints(userIDs)
+			assert.Equal(t, userIDs, partecipantsIDs)
+		}
+
+	}
+
+	// User 1 is issue1 poster (see fixtures/issue.yml)
+	// User 2 only labeled issue1 (see fixtures/comment.yml)
+	// Users 3 and 5 made actual comments (see fixtures/comment.yml)
+	checkPartecipants(1, []int{3,5})
+
+}